How to Get an NPI Number: Complete NPPES Registration Guide for Healthcare Providers

In This Article

• What Is an NPI Number?
• Who Needs an NPI Number?
• NPI Type 1 vs Type 2: Individual and Organizational NPIs
• What You Need Before Starting Your NPI Application
• Step by Step NPPES Registration Process
• Common NPI Registration Mistakes and How to Avoid Them
• How to Look Up an Existing NPI Number
• How to Update Your NPI Information
• NPI Deactivation and Reactivation
• NPI for Students and Residents
• NPI and CAQH ProView
• NPI and PECOS: Medicare Enrollment Requirements
• Can a Provider Have More Than One NPI?
• NPI vs Other Provider Identifiers
• Subpart NPIs for Multi Location Organizations
• NPI Enumeration Date and Credentialing Effective Dates
• NPI Registration Checklist

Key Takeaways

• Every healthcare provider who bills insurance or prescribes medications needs a National Provider Identifier (NPI) before they can begin credentialing or payer enrollment.
• NPI registration through NPPES is completely free and typically takes one to three business days for online applications.
• Type 1 NPIs are for individual providers (physicians, NPs, PAs, therapists) while Type 2 NPIs are for organizations (group practices, hospitals, labs).
• Selecting the correct taxonomy code during registration is critical; an incorrect code will cause delays in credentialing and insurance enrollment.
• Your NPI enumeration date affects your earliest possible credentialing effective date with most commercial and government payers.
• Keeping your NPI data current (address, taxonomy, practice locations) prevents claim denials and enrollment complications down the road.

Dr. Sarah Mitchell had just finished her internal medicine residency at Johns Hopkins Bayview in Baltimore and signed a contract with a private group practice in Towson, Maryland. Her start date was August 1st. The practice administrator told her to begin the insurance credentialing process immediately so she could bill patients from day one. Sarah submitted her applications to Blue Cross, Aetna, and CareFirst, expecting the process to move forward.

Three weeks later, she got the same response from every payer: "Application incomplete. No NPI on file."

Sarah had assumed her residency training program had obtained an NPI for her. They hadn't. She scrambled to apply through NPPES, received her number five days later, and then had to restart her credentialing applications from scratch. By the time her panels were approved, it was mid October. For two and a half months, every patient she saw generated revenue that the practice could not collect from insurance.

This scenario plays out across the country every year, especially with new graduates. The NPI is the first building block of provider credentialing, and without it, nothing else moves forward.

This guide walks through every aspect of obtaining, managing, and using your NPI number, from the initial NPPES application to the connection between your NPI and downstream enrollment systems like CAQH ProView and PECOS.

What Is an NPI Number?

The National Provider Identifier (NPI) is a unique 10 digit number assigned to healthcare providers in the United States. It was created under the Health Insurance Portability and Accountability Act (HIPAA) of 1996 and became mandatory for all covered entities on May 23, 2007.

Before the NPI system existed, each insurance company assigned its own proprietary provider numbers. A single physician might have had dozens of different IDs across Medicare, Medicaid, Blue Cross plans, and commercial carriers. The NPI replaced all of those legacy identifiers with one permanent number that follows the provider throughout their entire career.

The NPI does not expire. It does not change when a provider moves to a new state, joins a different practice, or switches specialties. Once assigned, the number remains with you permanently, unless it is deactivated under specific circumstances.

The Centers for Medicare and Medicaid Services (CMS) administers the NPI system through the National Plan and Provider Enumeration System, commonly known as NPPES.

Key facts about the NPI:

• It contains 10 digits with no embedded intelligence (the number itself does not indicate location, specialty, or provider type)
• It is required on every electronic healthcare transaction, including claims, eligibility checks, referrals, and prior authorizations
• It is public information; anyone can look up an NPI in the NPI Registry
• There is no cost to obtain one
• It is not the same as a license number, DEA number, or Medicare PTAN

Who Needs an NPI Number?

The short answer: any individual or organization that provides healthcare services and transmits health information in electronic form needs an NPI. This includes a much broader range of providers than most people expect.

Individual Providers (Type 1 NPI)

• Physicians (MD and DO)
• Nurse practitioners (NP)
• Physician assistants (PA)
• Psychologists
• Licensed clinical social workers (LCSW)
• Physical therapists (PT)
• Occupational therapists (OT)
• Speech language pathologists (SLP)
• Chiropractors
• Dentists
• Optometrists
• Podiatrists
• Pharmacists
• Certified registered nurse anesthetists (CRNA)
• Certified nurse midwives (CNM)
• Licensed professional counselors (LPC)
• Registered dietitians

Organizations (Type 2 NPI)

• Group medical practices
• Hospitals and health systems
• Skilled nursing facilities
• Home health agencies
• Clinical laboratories
• Pharmacies
• Durable medical equipment (DME) suppliers
• Ambulance services
• Ambulatory surgical centers
• Rehabilitation facilities

If you are a provider who bills any payer, whether commercial insurance, Medicare, Medicaid, TRICARE, or workers' compensation, you need an NPI. If your organization employs providers and bills under the organization's name, the organization needs its own NPI as well.

Even providers who only see cash pay patients should obtain an NPI. Prescribing medications through electronic prescribing systems requires an NPI, and many state licensing boards now request it during renewal.

NPI Type 1 vs Type 2: Individual and Organizational NPIs

Understanding the distinction between Type 1 and Type 2 NPIs is essential because choosing the wrong type during registration creates problems that ripple through every credentialing and billing process.

Type 1: Individual Provider

A Type 1 NPI is assigned to a single healthcare provider, meaning a human being with a professional license. This includes physicians, therapists, nurse practitioners, dentists, and all other individual practitioners listed above.

Important points about Type 1 NPIs:

• Each individual provider receives exactly one Type 1 NPI, regardless of how many practices they work at or how many states they are licensed in
• The NPI stays with the individual permanently
• A provider cannot have multiple Type 1 NPIs
• Solo practitioners who bill under their own name and SSN use a Type 1 NPI

Type 2: Organizational Provider

A Type 2 NPI is assigned to an organization that provides healthcare services. This could be a group practice, hospital, laboratory, pharmacy, or any other healthcare entity.

Important points about Type 2 NPIs:

• An organization can have multiple Type 2 NPIs (for example, one for each practice location or subpart)
• A Type 2 NPI requires an Employer Identification Number (EIN) from the IRS
• The application must include an authorized official who has legal authority to act on behalf of the organization
• Organizations that bill under their own tax ID need a Type 2 NPI

When You Need Both

Many providers need both types. A physician who works at a group practice will have their own Type 1 NPI (individual) while the group practice has a Type 2 NPI (organizational). Claims often list both numbers: the rendering provider's Type 1 NPI and the billing provider's Type 2 NPI.

If you are starting a new medical practice, you will need to apply for a Type 2 NPI for the practice itself, in addition to ensuring that every provider on staff has their own Type 1 NPI.

What You Need Before Starting Your NPI Application

Before you sit down at NPPES to fill out the application, gather all the required information. Having everything ready will prevent you from getting stuck halfway through the form and potentially losing your progress.

For Type 1 (Individual) Applications

• Social Security Number (SSN): Required for identity verification. NPPES will not accept an ITIN.
• Date of birth: Must match your SSN records exactly.
• State license number: At least one active state professional license. Include the state, license number, and license type.
• Practice address: The physical address where you provide patient care. P.O. boxes are not accepted for the practice location, though you can use one for your mailing address.
• Taxonomy code: The Healthcare Provider Taxonomy Code that best describes your specialty. More on this in the registration steps below.
• Contact information: Phone number and email address where NPPES can reach you.
• Country of graduation: Your medical or professional school and graduation year.

For Type 2 (Organizational) Applications

Everything listed above for the authorized official, plus:

• Employer Identification Number (EIN): Your organization's federal tax ID from the IRS.
• Organization legal name: Exactly as registered with the IRS.
• Doing business as (DBA) name: If your practice operates under a different name than the legal entity.
• Authorized official information: Full name, title, phone number, and email of the person legally authorized to act on behalf of the organization. This is typically the owner, CEO, or managing partner.
• Organization taxonomy code: The taxonomy code for the organization type (which may differ from individual provider taxonomies).

Write all of this information down or save it in a secure document before starting the online application.

Step by Step NPPES Registration Process

The entire NPI application process is completed online through the National Plan and Provider Enumeration System (NPPES). There is no fee at any point. If any website asks you to pay for an NPI, it is not the official CMS portal.

Step 1: Create an Identity and Access Management (I&A) Account

Before you can access the NPI application, you need an I&A account through CMS. This is the same identity verification system used for other CMS portals like PECOS.

1. Go to nppes.cms.hhs.gov
2. Click "Create an Account" or "Register"
3. Enter your personal information: name, SSN, date of birth, email address
4. Create a username and password that meets CMS security requirements (typically 8+ characters, uppercase, lowercase, number, special character)
5. Set up your security questions
6. Verify your email address by clicking the link sent to your inbox
7. Wait for your I&A account to be validated (this can take a few hours to one business day)

A common sticking point: if the information you enter does not match Social Security Administration records exactly, the system will reject your application. Make sure your legal name, SSN, and date of birth are entered precisely as they appear on your Social Security card.

Step 2: Log In and Begin the NPI Application

Once your I&A account is active:

1. Log into NPPES with your new credentials
2. Select "Apply for NPI"
3. Choose the entity type: Individual (Type 1) or Organization (Type 2)
4. Begin filling out the application form

The system saves your progress, so if you need to stop and come back, your data will still be there. However, applications that sit incomplete for more than 120 days may be purged from the system.

Step 3: Select Your Healthcare Provider Taxonomy Code

This is the step where the most mistakes happen. The Healthcare Provider Taxonomy Code is a standardized classification system that identifies your provider type, specialty, and subspecialty.

Taxonomy codes follow a hierarchical structure:

• Level 1: Provider type (e.g., "Allopathic & Osteopathic Physicians")
• Level 2: Classification (e.g., "Internal Medicine")
• Level 3: Area of specialization (e.g., "Cardiovascular Disease")

For example:

• A family medicine physician would select taxonomy code 207Q00000X
• A nurse practitioner in adult health would select 363L00000X
• A physical therapist would select 225100000X
• A clinical psychologist would select 103TC0700X

You can search for your correct taxonomy code using the taxonomy code lookup tool built into the NPPES application. You can also reference the National Uniform Claim Committee (NUCC) taxonomy list.

Why this matters so much: payers use your taxonomy code to determine which provider networks and fee schedules apply to you. If your taxonomy code does not match your actual credentials and scope of practice, payers will reject your credentialing applications. Some payers will not even process an enrollment application if the NPI taxonomy code conflicts with the specialty listed on the application.

You can select more than one taxonomy code if you practice in multiple specialties. However, you must designate one as your primary taxonomy.

Step 4: Enter Practice Location Information

The NPPES application requires at least one practice location where you deliver patient care.

Provide the following for each location:

• Physical street address (no P.O. boxes)
• City, state, ZIP code
• Phone number and fax number
• Whether this is your primary practice location

If you work at multiple locations, you can add them all during registration or add them later through an update. For credentialing purposes, the practice addresses on your NPI record should match the addresses you list on payer enrollment applications. Address mismatches between your NPI record and your credentialing applications are one of the most common reasons for enrollment delays.

You will also enter a mailing address, which can be different from your practice address. The mailing address is where NPPES will send any correspondence.

Step 5: Provide Authorized Official Information (Type 2 Only)

For organizational (Type 2) NPI applications, you must identify an authorized official. This person must have the legal authority to bind the organization and make changes to its NPI record.

The authorized official information includes:

• Full legal name
• Title or position within the organization
• Phone number
• Email address

The authorized official is responsible for the accuracy of all information in the organization's NPI record. If the authorized official leaves the organization, the NPI record must be updated with a new authorized official.

Step 6: Review, Submit, and Receive Your NPI

Before submitting, review every field carefully. Once submitted:

• Online applications are typically processed within one to three business days
• Paper applications (Form CMS 10114) take 10 to 15 business days or longer
• You will receive your NPI via email at the address you provided during registration
• Your NPI will also be searchable in the NPI Registry once it is assigned

There is no reason to submit a paper application unless you cannot access the internet. The online process is faster and allows you to track your application status.

Once you receive your NPI, record it immediately. You will need it for every credentialing application, CAQH profile, Medicare enrollment form, and insurance panel application you submit.

Common NPI Registration Mistakes and How to Avoid Them

After processing thousands of credentialing applications, these are the NPI errors we see most frequently.

Selecting the Wrong Taxonomy Code

This is by far the most common mistake. A family nurse practitioner who selects a physician taxonomy code, or an occupational therapist who picks a physical therapy taxonomy, will face rejection from every payer that cross references the NPI record against the enrollment application. Always verify your taxonomy code against your actual license type and board certification.

Choosing the Wrong Entity Type

Solo practitioners sometimes apply for a Type 2 (organizational) NPI when they should apply for a Type 1 (individual). If you are a solo provider billing under your SSN, you need a Type 1. If you have incorporated and bill under an EIN, you may need both a Type 1 (for yourself) and a Type 2 (for your entity).

Address Mismatches

The practice address on your NPI must match what you report to payers during credentialing. If you move to a new office and forget to update your NPI record, claims will be denied and credentialing applications will be flagged.

Not Updating After a Name Change

Providers who change their name (due to marriage, for example) must update their NPI record. If the name on your NPI does not match the name on your state license, payers will reject your enrollment application.

Duplicate Applications

Some providers accidentally submit multiple NPI applications, resulting in two Type 1 NPIs. This violates NPPES rules (each individual gets exactly one Type 1 NPI) and creates significant problems with billing and credentialing. If this happens, contact NPPES to deactivate the duplicate.

How to Look Up an Existing NPI Number

If you already have an NPI but cannot remember it, or if you need to verify another provider's NPI, use the NPI Registry.

The NPI Registry allows you to search by:

• NPI number
• Provider name (first and last)
• Organization name
• State
• City
• Taxonomy code
• ZIP code

All NPI records are public information. The registry displays the provider's name, NPI number, practice address, taxonomy code, and enumeration date.

You can also use PayerReady's NPI Lookup tool, which provides a cleaner search interface and additional context about what the NPI data means for credentialing.

For credentialing coordinators who need to verify NPI information for multiple providers, the NPPES also offers a downloadable data file (the NPI Data Dissemination file) that contains every NPI record in the system. This file is updated monthly and is available in CSV format.

How to Update Your NPI Information

Your NPI record is only useful if it is accurate. CMS requires providers to update their NPI information within 30 days of any change.

Changes That Require an NPI Update

• Practice address change (new office location)
• Mailing address change
• Phone or fax number change
• Name change (marriage, legal name change)
• Adding or removing practice locations
• Adding or changing taxonomy codes (new specialty or subspecialty)
• Change of authorized official (Type 2 only)
• Change of organization name or DBA (Type 2 only)

How to Make Changes

1. Log into NPPES with your I&A credentials
2. Select "Update/Manage NPI Record"
3. Make the necessary changes
4. Submit the update

Changes to your NPI record are typically reflected in the NPI Registry within one to two business days. After updating your NPI, also update your CAQH ProView profile and notify any payers you are enrolled with. Many payers pull NPI data periodically, but relying on that is risky. Proactive updates prevent claim denials.

NPI Deactivation and Reactivation

An NPI can be deactivated, but this should be done carefully because reactivation is not always straightforward.

Reasons for Deactivation

• The provider has retired and is no longer practicing
• The organization has closed permanently
• A duplicate NPI was issued in error
• The provider is deceased (typically reported by a family member or the practice)
• Fraud or misuse of the NPI (deactivated by CMS)

How to Deactivate

Log into NPPES, select your NPI record, and choose the deactivation option. You will need to provide a reason. Once deactivated, the NPI cannot be used on claims or enrollment applications.

Reactivation

If a deactivated NPI needs to be brought back into use (for example, a retired provider returns to practice), the provider must contact NPPES directly to request reactivation. This process involves identity verification and may take several weeks.

A deactivated NPI is never reassigned to a different provider. The number is permanently linked to the original entity.

NPI for Students and Residents

A frequent question from new graduates and residents: when should I apply for my NPI?

Medical Students

Medical students do not need an NPI during their training. They are not yet licensed providers and do not bill for services independently.

Residents

Residents should apply for their NPI during their first year of postgraduate training (PGY 1) at the latest. Many residency programs handle this as part of orientation. However, do not assume your program will do it for you. Verify with your program coordinator.

Reasons to get your NPI early in residency:

• You will need it for prescribing medications through e prescribing systems
• Some states require an NPI for your training license or permit
• Having your NPI established early gives you a longer enumeration history, which can benefit credentialing timelines after graduation
• The credentialing process after residency moves faster when your NPI is already active and attached to your training history

Timing Recommendation

Apply for your NPI as soon as you have an active state medical license or training permit. For most residents, this is within the first few weeks of PGY 1. If you are a fellow transitioning into a new subspecialty, you do not need a new NPI. You simply update your existing NPI with the new taxonomy code for your subspecialty.

NPI and CAQH ProView

Your NPI is the primary key that ties your identity together across the entire credentialing ecosystem. When you create your CAQH ProView profile, the very first piece of information requested is your NPI number.

CAQH uses your NPI to:

• Verify your identity against the NPPES database
• Auto populate certain fields in your profile (name, practice address, taxonomy)
• Link your credentialing data to payer systems
• Match re attestation requests to the correct provider

If the information in your NPI record conflicts with what you enter in CAQH, payers will flag the discrepancy during their verification process. This is why keeping your NPI data current is so important: it is the foundation layer that everything else builds on.

Many payers will not even begin processing a credentialing application until they can confirm your NPI in the NPPES registry.

NPI and PECOS: Medicare Enrollment Requirements

If you plan to participate in Medicare (and most providers do), your NPI is required before you can enroll through the Provider Enrollment, Chain, and Ownership System (PECOS).

The Medicare enrollment process works as follows:

1. Obtain your NPI through NPPES
2. Log into PECOS at pecos.cms.hhs.gov
3. Complete the appropriate CMS 855 form (855I for individual providers, 855B for groups, 855A for institutional providers)
4. Your NPI is linked to your Medicare enrollment and your PTAN (Provider Transaction Access Number)

Without an NPI, the PECOS system will not allow you to start an application. Medicare also cross references your NPI record with your enrollment data, so address and taxonomy mismatches between NPPES and PECOS will trigger delays.

For organizations enrolling in Medicare, the organization's Type 2 NPI must be active and current before submitting the CMS 855B. Each individual provider within the organization must also have a Type 1 NPI and must be reassigned to the organization through PECOS.

Can a Provider Have More Than One NPI?

This question comes up often, so here is the definitive answer.

Individual Providers: No

An individual healthcare provider is assigned exactly one Type 1 NPI. This is true regardless of how many states you are licensed in, how many practices you work at, or how many specialties you have. One person, one Type 1 NPI, forever.

If you discover that you have been assigned two Type 1 NPIs (which can happen due to duplicate applications), contact NPPES immediately to have the duplicate deactivated.

Organizations: Yes

An organization can have multiple Type 2 NPIs. The most common reason for this is subparts: distinct components of an organization that need to bill separately. More on this in the subpart section below.

NPI vs Other Provider Identifiers

The healthcare industry uses numerous provider identification numbers, and confusing them is easy. Here is how the NPI compares to other common identifiers.

The NPI does not replace your state license, DEA registration, or tax ID. It works alongside all of them. On a standard CMS 1500 claim form, you will list your NPI, your tax ID, and your rendering/billing information together.

Subpart NPIs for Multi Location Organizations

Organizations with multiple locations or distinct service lines often need subpart NPIs. A subpart is a component of an organization that has its own unique identification needs.

When to Use Subpart NPIs

• A medical group with offices in three different cities where each location needs to bill separately
• A hospital system where the hospital, the outpatient clinic, and the lab each submit claims independently
• A healthcare organization with both a physician group and a DME supply division

How Subpart NPIs Work

The parent organization holds one Type 2 NPI. Each subpart receives its own Type 2 NPI as well. On claims, the subpart NPI appears as the billing provider, and individual Type 1 NPIs appear as the rendering providers.

To apply for a subpart NPI, the organization's authorized official logs into NPPES and creates a new Type 2 NPI application, designating it as a subpart of the parent organization.

Subpart NPIs are particularly important for organizations going through payer enrollment because many payers require separate enrollment for each billing location.

NPI Enumeration Date and Why It Matters for Credentialing

Your NPI enumeration date is the date your NPI was officially assigned. This date is publicly visible in the NPI Registry and carries more weight in credentialing than most providers realize.

Here is why it matters:

• Many payers will not grant a credentialing effective date earlier than your NPI enumeration date
• If you obtained your NPI three months after starting at a new practice, you may lose three months of retroactive billing eligibility
• Some payers use the enumeration date as one factor when evaluating how long a provider has been in practice
• Medicare enrollment effective dates are tied to the date of your application filing, but your NPI must already be active at that point

This is exactly why the advice to apply for your NPI early (during residency, before you start a new job, before you launch a new practice) is so important. The earlier your enumeration date, the more flexibility you have with credentialing timelines.

For a full walkthrough of credentialing timelines and effective dates, see our step by step credentialing guide.

Cost of NPI Registration

This deserves its own brief section because of how many scam websites exist: NPI registration is completely free.

The official NPPES portal at nppes.cms.hhs.gov does not charge any fee for NPI applications, updates, or lookups. If you find a website charging $50, $100, or any other amount for NPI registration, you are not on the official CMS site. Several third party companies have created lookalike websites that charge providers for a service that CMS provides at no cost.

Always access NPPES directly through the .gov URL.

NPI Registration Checklist

Use this checklist to ensure a smooth NPI application process.

Before You Apply:

• Confirm you have an active state professional license (or training permit for residents)
• Locate your Social Security Number
• Identify your correct healthcare provider taxonomy code
• Write down your practice address (physical, not P.O. box)
• For Type 2 applications: have your EIN and authorized official information ready
• Verify that your legal name matches Social Security Administration records

During the Application:

• Create your I&A account at nppes.cms.hhs.gov
• Complete the email verification step
• Select the correct entity type (Type 1 for individual, Type 2 for organization)
• Enter your taxonomy code carefully; double check the code against NUCC standards
• Enter your practice location with the physical address that matches your payer enrollment applications
• Review all information before submitting

After You Receive Your NPI:

• Record your NPI number and store it securely
• Verify your listing in the NPI Registry
• Begin your CAQH ProView profile using your new NPI
• Start your payer credentialing applications
• If enrolling in Medicare, begin your PECOS application
• Provide your NPI to your billing company and practice administrator
• Set a reminder to review your NPI record annually for accuracy

Ongoing Maintenance:

• Update your NPI within 30 days of any change (address, name, taxonomy, practice location)
• Update your CAQH profile whenever you update your NPI
• Notify enrolled payers of address or practice changes
• If adding a new specialty, update your taxonomy code in NPPES

Next Steps

Your NPI is the starting point, but it is only the first step in getting fully credentialed and enrolled with insurance payers. Once you have your NPI in hand, the credentialing process moves quickly if you are prepared.

Here is the recommended sequence after obtaining your NPI:

1. Set up your CAQH ProView profile with your NPI and complete attestation. See our CAQH setup guide.
2. Begin payer credentialing applications with your target insurance companies. Our credentialing step by step guide covers the full process.
3. Enroll in Medicare through PECOS if applicable. Follow our Medicare PECOS enrollment guide.
4. Complete your credentialing checklist to ensure nothing is missed. Use our new practice credentialing checklist.

If you are a new physician finishing residency, our credentialing after residency guide covers the specific timeline and priorities for new graduates.

Need help managing your NPI, credentialing, and payer enrollment? PayerReady's credentialing platform tracks every step of the process so nothing falls through the cracks. From NPI verification to panel approval, our system keeps your enrollment on track and your revenue flowing.